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<h3 class="heading"><span class="type">Paragraph</span></h3>
<p><dfn class="terminology">Theorem</dfn> Suppose that <span class="process-math">\(y_1\)</span> and <span class="process-math">\(y_2\)</span> are solutions of</p>
<div class="displaymath process-math" data-contains-math-knowls="">
\begin{equation*}
y^{\prime \prime}+p(x) y^{\prime}+q(x) y=0,
\end{equation*}
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<p class="continuation">where <span class="process-math">\(p(x), q(x)\)</span> are continuous in an open interval <span class="process-math">\(I\text{.}\)</span> Then <span class="process-math">\(y_1, y_2\)</span> are linear dependent if and only if <span class="process-math">\(W(y_1, y_2)\)</span> is zero for all <span class="process-math">\(x\)</span> in <span class="process-math">\(I\text{.}\)</span></p>
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